Graphite conducts electricity. Two wires brush against the surface of a paper disk as it spins. The wires are connected to a simple electronic tone generator. When a line of graphite is drawn across the disk, connecting the two wires, a tone is heard, The quality of the line affects the sound. For example, if the line is thick, allowing more current to pass over it, the pith changes to a lower tone. via - http://calebcoppock.com/
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